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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: tìm x biết 5x(x-3)+7(x-3)=0 mn giúp mik vs, mik đag cần gấp!!

Toán Lớp 8: tìm x biết
5x(x-3)+7(x-3)=0
mn giúp mik vs, mik đag cần gấp!!

Comments ( 2 )

  1. $\text{5x.(x-3)+7.(x-3)=0}$
    $\text{(x-3).(5x+7)=0}$
    $\text{x-3=0 hoặc 5x+7=0}$
    $\text{x=3 hoặc 5x=-7}$
    $\text{x=3 hoặc x=}$$\frac{-7}{5}$
    $\text{KL:Vậy:x=3 hoặc x=}$$\frac{-7}{5}$
    $\text{#mct}$

  2. $ 5x ( x – 3 ) + 7 ( x – 3 ) = 0 $
    ⇒ $ ( x – 3 ) ( 5x + 7 ) = 0 $
    ⇒ \(\left[ \begin{array}{l}x-3=0\\5x+7=0\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x=3\\x=-\dfrac{7}{5}\end{array} \right.\) 
    Vậy $ x = 3 $hoặc $ x = – \dfrac{7}{5} $

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222-9+11+12:2*14+14 = ? ( )